Presumptive Democratic presidential nominee Hillary Clinton has to worry about a steep drop-off of the black vote that could imperil her chances of winning the White House in November, an analysis has found.

The number of African-Americans who voted in Tuesday’s primaries plummeted by an estimated 40 percent in Ohio, 38 percent in Florida and 34 percent in North Carolina compared with the 2008 Democratic primary when Barack Obama was on the ballot, reported the advocacy group Black Votes Matter.

Record numbers of African-American voters flocked to the polls to elect and re-elect America’s first black president.

Analysts expected some drop-off, but not the enormous numbers recorded Tuesday.